The invention relates to a gas supply unit (1) for supplying pressurized gas to a patient (8), wherein it comprises:&mdashA pneumatic housing (10) for supplying a flow of gas to the patient (P), &bull A control housing (20) for controlling the flow of gas to be supplied to the patient (P), and A power supply housing (30) for supplying power to the unit (1), wherein the three housings (10,20,30) are distinct from one another and are designed for being removably coupled together to form a single unit (1). It further relates to a respiratory System for supplying a patient (P) with pressurized gas, the System comprising such a gas supply unit (1).
